08-19-2020, 03:16 PM
That is a good tube tester, very similar to the ever popular TV-7. The only drawback is the way you set the GM ranges which is inaccurate especially on the 15000 setting. If I wanted to use one of these for, say, selling on Pay-Bay, then I would set fixed value resistors on a 4 position switch like on the 533 and 534.